<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>姓名案例_计算属性实现</title>
    <script src="../js/vue.js"></script>
</head>

<body>
    <div id="root">
        姓：<input type="text" v-model="firstName">
        <br><br>
        名：<input type="text" v-model="lastName">
        <br><br>
        全名：<span>{{fullName}}</span>
        <span>{{fullName}}</span>
        <span>{{fullName}}</span>
    </div>

    <script>
        // 阻止vue在启动时生成生产提示
        Vue.config.productionTip = false;
        const vm = new Vue({
            el: '#root',
            data: {
                firstName: '完颜',
                lastName: '永功'
            },
            computed: {
                fullName: {
                    // get什么时候调用？
                    // 初次读取fullName时；所依赖的数据发生变化时
                    get() {
                        console.log('get被调用了');
                        return this.firstName + '' + this.lastName
                    }
                }
            },
            methods: {
            }
        })
    </script>
</body>

</html>